The confidential AI chat assistant
AI should empower you, not exploit you for your data
AI where every conversation is private
Millions rely on popular AI chat tools to simplify their lives — often unaware that every message, idea, and piece of sensitive information can be harvested, stored, and sold. Lumo gives you the power of AI with one key difference: All conversations with Lumo are stored with zero-access encryption, so no one (not even Proton) can access them.
Lumo is created by the scientists behind Proton Mail, Proton VPN(new window), and the nonprofit Proton Foundation.
Your chats are yours and yours alone
The questions you ask Lumo — about your work, your health, or your ideas — aren’t accessible to us. So they can never be used to target ads, shape what you see online, or build a personal profile that third parties could exploit.
Safeguarded by advanced security
Your conversations are saved with zero-access encryption so that you’re the only one who can read them. Proton can never see them, and neither can anyone else.
With transparent code you can trust
Unlike with other AI assistants, Lumo’s code is fully open source, so anyone can verify that it’s private and secure — and that we never use your data to train AI models.
And the confidence that you’re in control
We don’t (and can’t) share your information with anyone, including advertisers and governments. And Lumo is a European service that complies with GDPR, so you can delete your account at anytime.
What makes Lumo different
Our approach proves AI can benefit society without compromising your data. See how Lumo compares with other AI chat assistants.
| | Lumo AI | Gemini | Copilot | OpenAI | Claude |
|---|---|---|---|---|---|
| Never uses your data to train AI | Yes | No | No | No | No |
| Does not log your chats | Yes | No | No | No | No |
| Can’t share your data with anyone | Yes | No | No | No | No |
| Has an ad-free business model | Yes | No | No | No | Yes |
| Based in a high-privacy jurisdiction | Yes | No | No | No | No |
| Opens source code to the public | Yes | No | No | No | No |
| |
Get even more from Lumo
Upgrade to Lumo Plus to get unlimited chats and the fastest responses — and to support our mission to build an internet that empowers digital freedom.
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What Lumo can help you do
Reclaim hours lost to time-consuming tasks and give them back to what truly matters: your loved ones, your passions, your peace of mind. Lumo empowers you with AI, while keeping your data strictly yours.
Power your business with a confidential AI assistant
Whether you’re drafting contracts, analyzing data, or exploring new ideas, Lumo for Business keeps your team’s conversations encrypted and under your control.
Built and based in Europe
Thanks to our legal home, Lumo benefits from robust privacy protections, free from Big Tech surveillance and outside of US jurisdiction.
Connect with Lumo on social
It’s the only place anyone will see your conversations.
@recant731
on X
Just got Lumo to help plan out a road trip, with detailed routes and budgets for stays and my car on fuel. @ProtonPrivacy already had me stoked and now @asklumo has too.
@markruffalo
via Instagram comment
There are other chat apps you can use that are actually just as good, cheaper or more private that don’t fund evil in the world. Lumo from ProtonMail comes to mind
@banasnap.bsky.social
on Bluesky
Promising premise: a privacy-first AI is exactly what the current landscape was missing. With most services dominated by US and Chinese companies, having a European-based option, from a team already well-versed in online privacy, fills a much-needed gap. Looking forward to trying Lumo.
tintreack
on Reddit
This is pretty awesome, and the mascot is kind of adorable. I really love the branding of this. Also, as a visionary user who has to use ChatGPT for his workflow, thank you. I can finally get rid of that. I've been testing it out, it's pretty great! Nice job team.
Frequently asked questions
- What is the best AI chat assistant for privacy?
- Can I use Lumo as an AI chat without logging in or signing up?
- How does Lumo compare with other AI tools like ChatGPT?
- Is Lumo a safe and secure AI chat assistant?